To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseDeveloper reply by Eyal Rozenberg
Rated 5 out of 5 stars
Amazing add-on. Worked perfectly for me! In addition it lets you check which email it will delete or keep with a very simple user interface.
Suggestion: It would be great to be able to open the emails from that interface (in case you have doubts about which message to keep) or implementing a "twin" reading pane to compare messages before deleting... (just an idea. In any case the add-on works perfectly now)
If you click a message in the dupe review dialog, it comes up in the 3-pane window (the main Thunderbird window).
To create your own collections, you must have a Mozilla Add-ons account.